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Net Capital Requirements and Customer Protection Requirements (Tables)
3 Months Ended
Mar. 31, 2012
Net Capital Requirements and Customer Protection Requirements [Abstract]  
Net capital requirements and customer protection requirements
                         
    MarketAxess
Corporation
    MarketAxess
Europe Limited
    MarketAxess
Canada Limited
 
    (In thousands)  

Net capital

  $ 62,641     $ 28,967     $ 414  

Minimum net capital required

    1,636       3,276       276  
   

 

 

   

 

 

   

 

 

 

Excess net capital

  $ 61,005     $ 25,691     $ 138